Brazilian Journal of Physics
On-line version ISSN 1678-4448
PIMENTA, M. A. et al. The anomalous dispersion of the disorder-induced and the second-order Raman Bands in Carbon Nanotubes. Braz. J. Phys. [online]. 2000, vol.30, n.2, pp. 423-427. ISSN 1678-4448. http://dx.doi.org/10.1590/S0103-97332000000200026.
In this work we have studied the dispersion of the disorder-induced (D) and the second-order (G') Raman bands in single wall carbon nanotubes using several laser excitation energies (E laser) in the range 1.5-3.0 eV. An anomalous step-like behavior was observed in the E laser dependence of the G'-band frequency. This result is interpreted as a manifestation of the one-dimensional (1D) behavior of the phonon spectrum in carbon nanotubes.